Lossless region of interest coding

(19)

(11)

EP 1 617 674 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	08.02.2006 Bulletin 2006/06

(43)	Date of publication A2:
	18.01.2006 Bulletin 2006/03

(21)	Application number: 05014431.0

(22)	Date of filing: 07.10.1998

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International Patent Classification (IPC):

H04N 7/26^(2006.01)

(84)	Designated Contracting States:
	DE ES FI FR IT
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

10.10.1997 SE 9703690
16.01.1998 SE 9800088

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	98948044.7 / 1021796

(71)	Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
	164 83 Stockholm (SE)

(72)	Inventors:
	Nister, David 756 47 Uppsala (SE) Christopoulos, Charilaos 192 55 Sollentuna (SE)

(74)	Representative: Holmberg, Martin Tor
	Bergenstrahle & Lindvall AB P.O. Box 17704 118 93 Stockholm 118 93 Stockholm (SE)

(54)	Lossless region of interest coding

(57) In a method and a device for transmission of S+P transform coded digitized images a mask is calculated by means of which a region of interest (ROI) can be transmitted lossless whereby the ROI can be transmitted and received lossless and still maintaining a good compression ratio for the image as a whole. This is possible since no or very few bits can be used for the remaining part of the image. The calculated mask can also be used for transmitting the coefficients needed for a lossless region of interest during any stage of the transmission.

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